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  1. tobebest

    Questions about Double block and bleed valve and float needle valve

    1.for DBB valve, any difference between reduced bore one and full bore one? 2.is there float needle valve? its construction? i need your advices,thank you in advance.
  2. tobebest

    why use shutdown valve together with choke valve ?

    Pls refer to the attachment: there are two shutdown valves---one 4" and the other 2" Q1: why use different sizes SD valves? Q2: the purpose of 2" SD valve connecting with a choke valve? Pls don't hesitate to share your ideas, thanks...
  3. tobebest

    In piping MTO, can anyone tell me the meaning of ASTM A234 WPB THD GALV for ELBOW description?

    for the ELBOW description, i really donot understand WPB, THD, GALV. PLEASE give share your understanding with me. thank you.
  4. tobebest

    what is swing elbow?

    @ EmmanuelTop thank you very much!i think the attachment is one page of a book and i am interested in this book. where can I purchase the book?
  5. tobebest

    what is swing elbow?

    I would like to know the difference between swing elbow and normal one and its application. I need your advices. thank you.http://files.engineering.com/getfile.aspx?folder=d2e1b3a0-6daf-4d25-b7f9-7bfc83691d29&file=11.png
  6. tobebest

    what is the difference between hot bends and cold bends?

    I know hot bends are used in pipelines,but i would like to know the application range of both ones. can anyone help me? THX
  7. tobebest

    what does "NS" mean in component description in MTO?

    For example: PIPE;LOW TEMP.CARBON STEEL 6 " NS,27.8 mm Thk ,168.3 mm OD ,1.094" Thk; SEAMLESS; ASTM A333 GR.6; NACE MR‐01‐75; BEVELLED ENDS NS underlined
  8. tobebest

    Does anyone know the valve(?) in the red circle and its function? THX

    now the attachment can be downloaded normally.
  9. tobebest

    Does anyone know the valve(?) in the red circle and its function? THX

    please refer to the subjecthttp://files.engineering.com/getfile.aspx?folder=50f392ed-a3f4-4cb6-abd8-929803c07bc0&file=20150319114824.png
  10. tobebest

    where should the spectacle blind be placed ? before valve or after valve?

    In PID, where should I place the spectacle blind, before valve or after valve(flow direction)? I need your advice
  11. tobebest

    Is the temperature up or down for liquid after the throttling valve?

    thank you everyone! I learned a lot. MortenA you are right, i assign the name of J-T valve,describing the function, there is no j-t valve.thank you so much. Hi,25362 thank you for the thread provided.it includes many useful informations
  12. tobebest

    Is the temperature up or down for liquid after the throttling valve?

    Hi, everyone! while doing hysys simulation, I found that following the J-T valve,the hydrocarbon gas T decreased, but for crude oil(liquid), it increased. why? is the liquid different from the gas on T passing through J-T valve? thanks in advance
  13. tobebest

    what is the difference of trip and inhibit in cause and effect diagram?

    when i check the Cause and Effect Diagram, sometimes the pump is tripped, sometimes the pump is inhibited. For example, the cause: oil separator ESD valve off open limit-----the effect:downstream charge pump is inhibited; the cause: HH pressure 3rd stage separator------the effect: downstream...
  14. tobebest

    what is the function of the bypass line with a ball valve followed by a globe valve?

    Hi, i am looking at the PID, and i don't know what is the function of the bypass line with ball valve and globe valve, can someone tell me? thank you in advance

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